abstract:In mechanics, a constant of motion is a quantity that is conserved throughout the motion, imposing in effect a constraint on the motion. However, it is a mathematical constraint, the natural consequence of the equations of motion, rather than a physical constraint (which would require extra constraint forces).
At Nikon's booth, Japanese dancers clad in a variety of "urban" dress, remained in constantmotion in an effort to demonstrate the autofocus abilities of the company's latest 1 Series cameras.
The steps get heavier and the speed increases until listeners are drawn into the movement of the rivers and the mills, the frenetic pace of an urban center in constantmotion.